Pressure gauge



F. A, ROUTHIER PRESSURE GAUGE Jan. 19, 1932.

Filed Dec. 28, 1928 Patented Jan. .19, 1932 narran STATES FEL'IX .ANTOINE ROUTHIER, OF MONTREAL,

PATENT ,orties QUEBEC, eenenA,,".as'sienonIv COMPANY; OF MONTREAL, GANADAfV f PRESSURE GAUGE Application filed December 28, 19%8, Serial removing'anything from the gauge box and f will also prevent the liquid from entering the gauge. boxl and destroying the small ymechanism as often happens in piston pressure gauges. Y

Another point, is that my invention vwill make these gauges more resistant and increase their durability. With the above and other objects in view which will be made clear as the specification proceeds, the invention Vconsists of a new gauge illustrated in the drawings, described in the specification and particularly set forth inthe appended claims.V

l have illustrated a single embodiment or" my invention but it is to be understood that l do not restrict myself to this form only, but reserve the right to alter my gauge in any manner possible so long as it comes within the scope of my claims.Y

In the drawings p- Y Fig. l is a cross section of a gauge with its attachment embodying my invention.

Fig. 2 is a front view showing my invention as it appears when assembled.

Fig. 3 is a rear view ofthe gauge with al cross section of the attachment, showing details of the pieces and the manner in which they are assembled.

Fig. l is a side view of the gauge with its attachments assembled. l

Referring to the drawings, Figure l represents my new gauge with its attachments and shows how the pieces are assembled on the inside. f y

The head of the screw (l) is outside of No.'329, 016, and lin Canada April 5, i928.

the gaugecase, and permits adjustment of the tensionof the Vspring (2) during the operation of the gauge without V.removing any parts, and also permits the whole mechanism to conform to such adjustment because this spring (2) acts directly on the piston rod (3) which by means ot a lever system and gears communicates its movements to the indicating needle (l0) whichoperatescver a graduated disk (l1).

The leversystem and gears have net been illustrated because they are the same as those commonly used in such gauges. 'i

As shown in Figures l and 3 the piston rod has been kcut at and sotacilitates the gauge box being taken eil kte replace 'packing (9) when worn out.

he manner ofkv removing the gauge box is easily' understood. By disconnectingV the threadedl nut (l2) and pulling the gauge case (5),.the gland. (8) will follow giving access to the packing (9) and allowing changing of the same. The advantage in this case is the replacement of worn out packing without aecting the gauge eXactness, as the gauge box (5) is not to be opened.

A central compartment (6) providedin the gland (8) and communicating with the atmosphere by small holes (7) allows the liquid that may leak between the packing and the piston rod to dis-charge outside and so prevents the liquid leaking `from gaining access to the inside of the gauge boX and thus destroy the delicate mechanism of the levers and gears. a

The nut (12) is used to adjust the pressure of the stufiing boX` gland (8) on the packing (9) which is inserted around the piston rod in the cylinder of the block (13)-, lVhen operating under high pressure a few turns of the nut (l2) will increase the pressure of the stuliingbox gland (8) on the packing (9), when low pressure is used the` nut (l2) is unscrewed a few turns, which decreases the pressure on the packing (9)'.y allowing the piston rod to move easier inthe cylinder block (13) thus increasing its sensitiveness.

TO B. TRU DEL When the gauge is in operation, the pisi pressure making contact at (14) and this communicates the movement to the lever system fixed on the piston liead (17). lVhen the pressure is discontinued the spring (Q) brings the piston (3) into position, and so moves the mechanism which brings the indicating needle back to zero position.

Vhat I claim as my invention is 1. In a device of the class described, a

1a gauge case, a piston head in said case operable in one direction under Vfluid pressure, means operating on the piston head in the opposite direction and tending to return it to a normal position when thefluid pressure is removed, a piston rod for the piston head extending outside the gauge case, a block having a cylindrical bore formed to provide a packing compartment into which the piston rod slidably extends, packing in the 20 compartment co-acting with the piston rod, a stuffing bor; gland secured to the gauge case encircling the piston rod and engaging the packing, a nut connecting the gland to the lock, said gland having a drain opening. 2. The device claimed in claim 1, in which the means tending to return the piston head to a normal position consists of a spring.

The device claimed in claim 1, in which the stufling box gland is formed with a coms@ partment With which the drain opening cemmunicates.

4. The device claimed in claim 1, in which the piston head is carried by a piston rod operating in the gauge case, and a second piston rod slidably mounted in the cylindrical bore and abutting the iirst piston rod, the second piston rod having one end adapted to be subjected to fluid pressure.

5. The device claimed in claim 1, in which -40 a screw is threaded into the gauge case and is capable of adjustment and a spring is inserted between this screw and the piston head.

Signed at Montreal, this twenty-sixth day of November, 1928.

FELIX ANTGINE ROUTHIER. 

